He's officially taken, ladies!

On Monday night, Nick Lachey sported his wedding ring at his first event since marrying and honeymooning with Vanessa Minnillo. He hit NBC's party at the SLS Hotel in Beverly Hills, wearing his band proudly.

Lachey is the host of NBC's The Sing-Off. Vanessa did not join him for the soiree, but plenty of other stars were there, including the celebs of E! (NBC Universal and E! merged in 2010) -- like Kendra Wilkinson and hubby Hank and Ice T and Coco!

See a pic of Ice T and Coco after the jump -- she's wearing a shockingly conservative dress!